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Abstract:

A switch for universal serial bus is disclosed. The universal serial bus
(USB) port has a built switch actuator that automatically turns power on
and off upon insertion and removal of a USB plug. The switch for
universal serial bus comprises of a USB port with a switch actuator in a
power-off position and a momentary switch wherein when a USB plug is
inserted into the USB port, the switch actuator is depressed which in
turn depresses the momentary switch to turn on the power to the USB port.
When the USB plug is removed from the USB port, the switch actuator
returns to its original power-off position thereby turning off the power
to the USB port.

Claims:

1. A switch for universal serial bus comprising: a universal serial bus;
a switch actuator affixed to said universal serial bus; and a momentary
switch disposed near said switch actuator; whereby when said switch
actuator is actuated, said switch actuator depresses said momentary
switch.

2. A switch for universal serial bus as in claim 1 wherein said momentary
switch activates a power circuit to turn on power to the universal serial
bus when a universal serial bus plug is inserted into the universal
serial bus.

3. A switch for universal serial bus as in claim 2 wherein when said
universal serial bus plug is removed from the universal serial bus, said
momentary switch turns off the power to the universal serial bus.

4. A switch for universal serial bus as in claim 1 wherein when a
universal serial bus plug is inserted into the universal serial bus, the
switch actuator is urged to depress the momentary switch.

5. A switch for universal serial bus as in claim 4 wherein when said
universal serial bus plug is removed from the universal serial bus, said
switch actuator returns to a position away from the momentary switch.

6. A switch for universal serial bus as in claim 1 wherein said switch
actuator is an elongated tab flexibly affixed to said universal serial
bus.

7. A switch for universal serial bus as in claim 6 wherein said elongated
tab has a free end that normally protrudes into an interior of the
universal serial bus wherein when a universal serial bus plug is inserted
into the interior of the universal serial bus, said free end flexes out
of the interior of the universal serial bus and when said universal
serial bus plug is removed from the interior of the universal serial bus,
said free end flexes back into the interior of the universal serial bus.

8. A switch for universal serial bus as in claim 7 wherein said free end
is directed away from an open end of said universal serial bus where said
universal serial bus plug is inserted.

9. A switch for universal serial bus comprising: a universal serial bus;
a switch actuator affixed to said universal serial bus wherein said
switch actuator is an elongated tab flexibly affixed to said universal
serial bus and has a free end that normally protrudes into an interior of
the universal serial bus wherein when a universal serial bus plug is
inserted into the interior of the universal serial bus, said free end
flexes out of the interior of the universal serial bus and when said
universal serial bus plug is removed from the interior of the universal
serial bus, said free end flexes back into the interior of the universal
serial bus; and a momentary switch disposed near said free end of said
switch actuator wherein said momentary switch activates a power circuit
to turn on power to the universal serial bus when a universal serial bus
plug is inserted into the universal serial bus and when said universal
serial bus plug is removed from the universal serial bus, said momentary
switch turns off the power to the universal serial bus.

[0002] Universal serial bus (USB) is a specification created around 1996
to establish communication between electronic devices and a host
controller. The host controller is usually a computer. USB can carry both
power and data. It is intended to replace a variety of serial and
parallel ports. USB is used to connect computer peripherals such as mice,
keyboards, digital cameras, printers, flash drives, and external hard
drives to a computer. It has become a common electronic interface for
many modern electronic devices and computers.

[0003] The standard USB port has a rectangular opening with a plastic
tongue that is enclosed in a metal sheath. There are four electrical
contacts on the plastic tongue. The metal sheath has a locking tab on
each narrow side and two locking tabs on the top and also on the bottom
wider sides. The locking tabs are formed from cutouts in the metal sheath
and are in the shape of elongated triangles. The short base of the
elongated triangle remains affixed to the metal sheath, and the tip of
the elongated triangle has a bend that extends into the USB port. The
flexing of the elongated triangle bias the bend near the tip of the
elongated triangle to exerts a retaining frictional force on the USB plug
when it is inserted into the USB port. The tips of the elongated
triangles at the narrow sides are oriented toward the rear of the USB
port. The tips of the elongated triangles at the wider sides are oriented
toward the front of the USB port. The standard USB plug has a compatible
plug that can only plug into the USB port in one orientation.

[0004] The standard USB port in the prior art is a simple connector that
has no control or switch to regulate the power supplied at the connector.
Irrespective of whether a USB plug is inserted into the USB port, the
standard USB port will have power at the connector. There is no switching
means at the standard USB port to turn power on and off. A substantial
amount of power is being consumed even when no USB plug is inserted in
the USB port.

BRIEF SUMMARY OF THE INVENTION

[0005] The switch for universal serial bus of the present invention is a
universal serial bus (USB) port with a built in switch to automatically
turn power on and off upon insertion and removal of a USB plug. The
switch for universal serial bus comprises of a USB port with a switch
actuator in a power-off position and a momentary switch wherein when a
USB plug is inserted into the USB port, the switch actuator is depressed
which in turn depresses the momentary switch to turn on the power to the
USB port. When the USB plug is removed from the USB port, the switch
actuator returns to its original power-off position away from the
momentary switch thereby turning off the power to the USB port.

[0006] An object of the switch for universal serial bus is to provide a
USB port that consumes virtually no power when no USB plug is inserted. A
further object of the switch for universal serial bus is to provide an
automatic switch to turn power on and off at the USB port when a USB plug
is inserted and removed. Another object of the switch for universal
serial bus is to provide a low cost automatic switch at the USB port to
minimize energy consumption when it is not being used.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 shows a perspective view of the preferred embodiment of the
switch for universal serial bus.

[0008] FIG. 2 shows another perspective view of the preferred embodiment
of the switch for universal serial bus.

[0009] FIG. 3 shows the front view of the preferred embodiment of the
switch for universal serial bus.

[0010] FIG. 4 shows the left side view of the preferred embodiment of the
switch for universal serial bus.

[0011] FIG. 5 shows the rear view of the preferred embodiment of the
switch for universal serial bus.

[0012] FIG. 6 shows the top view of the preferred embodiment of the switch
for universal serial bus.

[0013] FIG. 7 shows the bottom view of the preferred embodiment of the
switch for universal serial bus.

[0014] FIG. 8 shows a perspective view of an embodiment of the switch for
universal serial bus before the universal serial bus plug is inserted.

[0015] FIG. 9 shows a perspective view of an embodiment of the switch for
universal serial bus after the universal serial bus plug is inserted.

[0016] FIG. 10 shows a side view of an embodiment of the switch for
universal serial bus before the universal serial bus plug is inserted.

[0017] FIG. 11 shows a side view of an embodiment of the switch for
universal serial bus during the insertion of the universal serial bus
plug.

[0018] FIG. 12 shows a side view of an embodiment of the switch for
universal serial bus after the universal serial bus plug is inserted.

[0019] FIG. 13 shows a schematic diagram of an embodiment of the switch
for universal serial bus in a vehicle power adapter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0020] The following description and figures are meant to be illustrative
only and not limiting. Other embodiments of this invention will be
apparent to those of ordinary skill in the art in view of this
description.

[0021] In the preferred embodiment shown in the figures, switch for
universal serial bus comprises of a built in switch to automatically turn
power on and off upon insertion and removal of a USB plug 4. The switch
for universal serial bus comprises of a USB port 1 with a switch actuator
2 in a power-off position and a momentary switch 3 wherein when a USB
plug 4 is inserted into the USB port 1, the switch actuator 2 is
depressed which in turn depresses the momentary switch 3 to turn on the
power to the USB port 1 as shown in FIGS. 8 through 12. When the USB plug
4 is removed from the USB port 1, the switch actuator 2 returns to its
original power-off position away from the momentary switch 3 thereby
turning off the power to the USB port 1.

[0022] In the preferred embodiment, the switch actuator 2 is an elongated
tab generally in the shape of an elongated triangle as shown in FIGS. 1
and 7. One end of the elongated tab is flexibly affixed to the USB port
1. The other end of the elongated tab is free to flex into and out of the
USB port 1. As shown in FIGS. 10 through 12, the free end of the
elongated tab is formed such that a portion protrudes into the USB port 1
when no USB plug 4 is in the USB port 1 and a portion extends outside of
the USB port 1 when a USB plug 4 is in the USB port 1. This can be
accomplished by a "z" shaped bend at the free end of the elongated tab.
The switch actuator 2 is preferably one of the locking tabs on the USB
port's metal sheath. In one embodiment, the locking tab that is used as a
switch actuator 2 is one of the two locking tabs on the bottom wide side
of the USB port 1. The orientation of the locking tab that is used as the
switch actuator 2 is opposite that of the other locking tab on the bottom
wide side. This will position the free end of the switch actuator 2 away
from where the USB plug 4 enters the USB port 1 thereby provide more
space to position the momentary switch 3 under the free end.

[0023] As shown in FIGS. 8, 10, 11, and 12, a momentary switch 3 is
positioned adjacent to the portion of the elongated tab that extends
outside of the USB port 1 such that when the elongated tab is forced
outward from the USB port 1, it will depress the momentary switch 3. The
momentary switch 3 opens and closes a power circuit that powers the USB
port 1.

[0024] As shown in FIGS. 10 through 12, when a USB plug 4 is inserted into
the USB port 1, the USB plug 4 will force the switch actuator 2 to flex
out of the USB port 1. The free end of the switch actuator 2 will then
depress the momentary switch 3 to activate the power circuit. When the
USB plug 4 is removed from the USB port 1, the switch actuator 2 returns
to its original position with a portion protruding into the USB port 1.
In this position, the pressure from the switch actuator 2 on the
momentary switch 3 is removed. The momentary switch 3 then turns off the
power circuit.

[0025] One application of the switch for universal serial bus is shown in
FIG. 13. In this embodiment, the switch for universal serial bus is
embodied in a vehicle power adapter for recharging a mobile device such
as a mobile phone with a car's 12V battery. Without a switch for
universal serial bus, in the normal idle mode, the battery current is 5
to 10 mA. When the switch for universal serial bus is used, the battery
current reduces to 10 μA. This is a very substantial 1000 to 1
reduction in energy use with the use of the current invention.

[0026] Although the invention has been described in terms of particular
embodiments and applications, one of ordinary skill in the art, in light
of this teaching, can generate additional embodiments and modifications
without departing from the spirit of or exceeding the scope of the
claimed invention. Accordingly, it is to be understood that the drawings
and descriptions herein are proffered by way of example to facilitate
comprehension of the invention and should not be construed to limit the
scope thereof.